Thermostatic valve



P. MIRK. i THERmosTATIc vALvE. APPLICATION FILED JULY 3,1919.

Patented May 25,1920.

CII

UNITED STATES PATENT OFFICE..

PAUL T/IIRK, OF NEV YORK, LN. Y.

THERMOSTATIC VALVE.

Application 'filed July 3,

Be it lrnown that l, PAUL Minn, a subject of Germany, (who has declaredhis intention to become a citizen of the United Stated) and resident ofthe city of New York7 in the county of New York and State of New York,have invented certain new and useful lmprovements in ThermostaticValves, of which the following is a speciication.

This invention relates to automatic airrelief valves for steam"radiators and analogous structures, having reference particularl' r tothat class of valves in which a thermostatic controlling device isemployed.

The object of my invention is to provide a thermo-acting valve ofsimple, inexpensive and efficient construction which permits thedischarge of confined air from the radiator, Szc., by the pressure ofthe advancing steam? and yet efectually precludes the escape of theV`steam to the atmosphere; the components of which valve are soconstructed and organized that the thermostatic member thereof isisolated from the path of the steam and is iniiuenced solely by thethermal)k condition 'of the radiator; and that normally the said memberLacts to maintain the valve open in order to permit the rescape of thevair, yet when the member is influenced' by the heaty of conduction fromthe radiator, &c.,`the valve head is released and permitted to'bepositively closed by means extraneous of the thermostatic member,` thuspreventing the escape'of the steam.

A vfurther object of my invention is to provide a valve havingthermostatic device which can be simply and cheaply constructed andreadily applied to or removed from the valve structure and which devicevpossesses the further merits of functional y struction and combinationsof parts which will be hereinafter fully described and claimed.

ln the annexed drawings* Figure l is a side elevation of a thermostatioair-relief valve embodying a preferred form of my invention.

Fig. 2 is a longitudinal vertical section of the same, enlarged.

Referring to the drawings, 10 designates a metal body having ay centralbore 1l into i.ateiiterl May 25, 192).

iaia seriai No. 308,550.

one end of which is screwed a projection 1Q having an axial port 13extending therethrough. This projection may be integral with the body ifdesired. T he opposite end of the body comprises a screw-thieadedportion 14k adapted to be entered into a tapped orifice in the wall ofradiator section or other steam-heated metal structure. Wvithin the bodyis loosely fitted a valve head 14C which is movable toward or from theinner end of the port 13 so as to close or open the latter as desired. Aspring 15 confined within the body 10 tends to urge the valve head toclosing position, which spring in the present instance bears at itsrespective ends against the opposing end of the valve head and aninternal flange 16 on the lower end of the body.

Extending loosely through the axial port of the projection 12 is a pin17, one end of which rests upon the movable valve head while the otherend projects eXteriorl y of the projection, whereby the pin may beforced inwardly in yorder to move the valve head from its closingposition in opposition to the action ofthe spring. Screwed intol atapped socket in the exterior of the body 10 is vthe extremity of oneleg 18 of a U- yshaped thermostatic device, the other leg 19 whereof yispositioned to overhang theV outer projecting end 'of the pin. Normallythe leg 19 bears upon Vthe pin 1T in a manner lto hold the valve head 14positively in down or open position against the stress of the spring;but the construction of the thermostatic device is such thatwhen it issubjected to a predetermined temperatureY theleg 19 is rdeflected upwardor outward suicientlyto permit the springto press the valve head to itsseat. Hence when the radiator7 for eX- ample, is below a predeterminedeffective temperature the valve is open7 and the air7 under the pressureof. advancing steam, is permitted to escape through the port 13; butwhen such temperature is reached the thermostatic device, being heatedby conduction, is actuated to release the valve head and thus close theport, thereby preventing the escape of the steam to the atmosphere.Vl/Vhen thel temperature of the radiator yagain drops the thermostaticdevice resumes its normal or contracted condition and thus effects theopening of the valve port as before. K v

The preferred form of thermostatic device herein illustrated comprises ahollow l tubular member closed at its respective ends and filled with aheavy eXpansible liquid, 20, havinga lhigh melting point, such, for'eX-g ample, as linseed or paraiin oil.' This member is bent into U-formand seciiredV at one end f, to the body l0 as Vabove mentioned.

Freferably the tubular member isconsti-k tuted by a cylindrical rodwhich is longitudinally bored throughout the greater part of its length,the closed end thereof beingexternally screw-threaded, as 4at 2l, forapplication to the threadedy socket in the body 10. T he opposite end ofthe rod is provided Witlian internal seat 22-for a liber -plug or gasket23, and is screw-threaded, as at 24,?to receive one end' of asolidterminal pieo'e- 25. Before the application or' the plugand endpiece the bored rod is bent into U-form, itsr hollow body assuming anelliptical Jform in cross-section, and the bore is illedWith the thermalliquid which is introduced through the central aperture' in the seat 22;Thus when the plug andend piecepare applied the iilled member ishermetically sealed'. f If desiredfthe terminal piece may be,` solderedasY L ivelhas screwed4 tothe filled j member; the

plugfor gasketpreventing the contactfof'theV ythermal, fluid .Withthe'solder.

f ,The thermostatio v.device tthus )constructed can be readilyjturnedvonitsscreiv oonnec-l tionV and swung laterally ofthepin iii ordertopermit'theremoval, inspection, repair or renewal of the latter or oftheinternal/Ine'm' bers of the valve structure.A F rom the foregoing itwill be seen'that the v-metalsbodyof `the r thermos'tatigen device is YVi`solated fromV the path yoffthesteam in Vthey radiatori," andzthati,said body",v is" heated` by v conduction, the heat VVbeing-1thencetrans-Ty 40, Y f order to ex'pandtheflatter and'thus eieot in theyout'ivardfIrieveinent ofthe ,terminal or 'f V-Vbearin'gr'end' Yof thedevice.V Hence the o1: era--- tionfof thewdeviceto permit` the closingVof rtheivalve bythe i'oroe of the spring (to ymittedf to the confined#thermal liquidin vwhich the kpressure of the Vsteam contributes) isVinsuredl when andonlyfjivhen the y radiator or otherA structuretorwhich it is appliedv reaches a vcertain temperature. Since 'the valveis positively seated as just described, aV

'reliable sealing ofthe discharge opening is insured, thus effectuallypreventing the escape ofthe steam. h/Ioreover as lthe device is p visolated from the steam as above mentioned, no inolo'sure for suchdevice is required, and, therefore there is no resultingtrap forivlatei'yoi condensation.

tion, said latter portion being in. angular relation toj thelongitudinal axis of said body, a valve head coniinedlwith-insaid bodyand' arranged to .open and closethe inner end oi the port, 1a pinextending throughi saidV port vfr'ro'mlthe valve head, anda thermostatic1 device; exterior-ly 'of saidrbodyV 'and isolated fromVV the. steann'said deviceV comprisingfa Y U-tube containing-a thermal liquickone' endof the tube beingclosedand having a sieren7` threaded' portion forengagement with the said 'supporting portion of' the value body,

and. the opposite' end ofsaid` t'ube having a terminal-piece .whichbears' against *the` outer Y end. of the pin and'inaiifitainsV the-valvehead normallyr in open- Vcondition;`

forated seat at the opposite open-end, a'gasket y QQ-An airgvalveVhaving a rUshapedtherV inostatic devioejcornprisingatubular mem: ber'closed fand externally screw-Qthifeaided` atv oneend, and providedWithV `arr internalfipera arranged Within said open endy and bearing eon saidl seat, andi-fa; terminal piece 'fittedsinto saidf openr rendand' bearing ,against V the p l 'Y .9.5

gasket. l

y VSi5,g fned at YNeivYorkpin theicoiintyand State of New York,thissecondday ofJuly, 1A. Dgieial e i f PAUL M131@

